In the first pics I was thinking, 'i'm not going to like this scheme' however, I love the final product and think it looks great, well done mate.
While people may go on about historical accuracy (myself included) providing you use the correct colours (or as near as we modellers ever can) I think you can have free reign with the pattern to an extent, as the crews of the tanks did themselves, therefore meaning that anything we can think of, they probably did too. Of course it is great to have photographs etc. to support a paint scheme, but I wouldn't lose any sleep over it if you're happy with it.
Good work, look forward to seeing the finished piece!
James